Dear Dr Schiavi,

Thank you very much for the sent info. Additionally, a Sience Slam presentation is supposed to be entertaining, and this has nothing to do with the age of the presenter. Do you have some knowledge/experience in this direction?

Thank you in advance for your promt answer

A suggestion: Hyperelasticity, e.g. when a crack in a bulk of material propagates as faster than its phonons. In attach I send you a couple of works, I do hope it helps.

The 618-Proceedings is:

A. Schiavi , G. Lacidogna , G. Niccolini, A. Carpinteri, “Elastic emission or very low frequency acoustic emission in solids under compression”, 19th European Conference on Fracture - Fracture Mechanics for Durability, Reliability and Safety, Kazan, Russia, Augustus 26-31, 2012

Dear Dr Schiavi,

Thank you very much for the sent info. Additionally, a Sience Slam presentation is supposed to be entertaining, and this has nothing to do with the age of the presenter. Do you have some knowledge/experience in this direction?

Thank you in advance for your promt answer

Dear Cris,

unfortunately I have not experience in that direction. Anyway your proposal is exciting, so I try to give you an idea on this topic.

You can image the two most popular Zeno's paradoxes of  Achilles and the tortoise and of the arrow. In a certain way supersonic crack and phonons behave like that.